When this grave was first transcribed Surname was not known, since then I have done a search on ancestry and came up with a match for Kanbei which has revealed Nada as surname for this family.
U.S., Social Security Death Index, 1935-Current about Kanbei Nada
Name: Kanbei Nada
SSN:
Last Residence: 96716 Hanapepe, Kauai, Hawaii, USA
Born: 26 Feb 1870
Died: Feb 1966
State (Year) SSN issued: Hawaii (Before 1951)